If you uploaded the file, click the filename to open it. The workbook will open in a new tab in your web browser.

Click the Edit in Excel button. If you don't have this button, click Edit in Browser, and then click Edit in Excel after the page reloads.

If you are prompted to choose a version of Excel, click Excel 2016.

When the file opens in the Excel program, click Share in the upper-right.

Type email addresses in the Invite people box, and separate each with a semicolon. Make sure to also select Can edit. When you’re done, click the Send button.

Tip: Look at the bottom of the pane. The Get a sharing link lets you send the email invitation yourself. If you have Excel for Office 365 subscribers, you'll see the Send as attachment link. That lets you send a copy of the file as either an .xlsx, or .pdf file in an email message.

If you clicked the Send button in the previous step, email messages will be sent to each person. The message will come from your email address. You will also receive a copy of the message, just so you know what it looks like.

If you clicked the Share button, people will receive an email message inviting them to open the file. They can click the link to open the workbook. A web browser will open, and the workbook will open in Excel Online. If they want to edit in the browser, they can click Edit Workbook > Edit in Browser. If they want to open it in the Excel app, they can click Edit Workbook > Edit in Excel.

Tip: If they're using the latest version of Excel, PowerPoint, or Word there's an easier way: They can click File > Open and select Shared with Me.

More than one person can edit a workbook at the same time. This is called co-authoring. However, everyone will need a version of the Excel app that supports co-authoring. At this time, Excel for Android, Excel for iOS, Excel Mobile, and Excel 2016 for Office 365 subscribers are the versions that currently support co-authoring. If they don't have a supported version, they can click Edit Workbook > Edit in Browser to edit the file in Excel Online.

If you uploaded the file, click the filename to open it. The workbook will open in a new tab in your web browser.

Click the Edit in Excel button. If you don't have this button, click Edit in Browser, and then click Edit in Excel after the page reloads.

Click Open Microsoft Excel.

When the file opens in the Excel program, you may see a yellow bar which says the file is in Protected View. Click the Enable Editing button if that's the case.

Click Share in the upper-right.

Click Invite People. Then type email addresses, and separate each with a semicolon. Make sure to also select Can Edit. When you’re done, click the Share button.

Tip: If you want to send the link yourself, click Share in the upper-right, and then click Copy Link > View and Edit.

If you clicked the Share button in the previous step, email messages will be sent to each person. The message will come from your email address. You will also receive a copy of the message, just so you know what it looks like.

If you clicked the Share button, people will receive an email message inviting them to open the file. They can click the link to open the workbook. A web browser will open, and the workbook will open in Excel Online. If they want to edit in the browser, they can click Edit Workbook > Edit in Browser. If they want to open it in the Excel app, they can click Edit Workbook > Edit in Excel.

Tip: If they're using the latest version of Excel 2016 for Office 365 subscribers, they can open the file directly in the Excel app. They can click File > Open... > Shared, and then select a file that has been shared by another person.

More than one person can edit a workbook at the same time. This is called co-authoring. However, everyone will need a version of the Excel app that supports co-authoring. At this time, Excel for Android, Excel for iOS, Excel Mobile, and Excel 2016 for Office 365 subscribers are the versions that currently support co-authoring. If they don't have a supported version, they can click Edit Workbook > Edit in Browser to edit the file in Excel Online.